Wheel contour dresser



July 31, 1945. w HAHIR 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 I 5 Sheets-Sheet 1 July 31,1945. w HAHIR 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 5 Sheets-Sheet 2 INVENTOR.

y 1945- w. H. HAHIR 2,330,693

WHEEL CONTOUR DRE SSER F ile d March 15, 1944 5 Sheets-Sheet s w a I INVEN TOR.

A ain/5v? July 31, 1945. HAHN; 2,380,693

WHEEL CONTOUR DRESSER Filed March 15, 1944 5 SheetsSheet 4 29 F 2 i 29 Ia as 26 -1 WKM/ zip 5/ m l|l w m }}:mu 2a '5 \\1.l

INVENTOR.

' ATTORNEY.

y 1945- w. H. HAHIR WHEEL CONTOUR DRESSER Filed March 15, 1944 5Sheets-Sheet 5 Patented July 31, 1945 WHEEL CONTOUR DRESSER Ward H.Hahir, San Mateo, Calif., a'slignor to Sohlage Lock Company, SanFrancisco, Calif.,

a corporation of California Application Marcus, 1044, Serial No. 528,827

a Claims. (o1.- izs-u) This invention relates mainly to a machine fordressing or truing emery wheels or the like. particularly when thecutting or grinding face of the wheel is composed of curves ofdii'ierent radii and also to the dressing of wheels where the curvedsurface terminates in a face disposed on an angle of a predetermineddegree to' the wheel iace.

In most machines employed for this class of work a special templet fiveto ten times larger thantheoriginalsizedcurvetobedressed or formed inthe cutting face of an emery wheel must be made and properly set up andsecured in order that the follower which guides the diamond holder ordresser may function accurately. 'Both the making and setting up'of thetemplet is expensive andobviously one templet will only serve for thecurvature for which it is designed. Hence,

when another curve is required a new templet will have to be made.

The object of the present invention is to provide a contour dresser thatmay be secured upon and used in conjunction with a universal grindingmachine and further to provide a dresser for the dressing or truing oiemery wheels or the like particularly when the cutting or grinding facestarting position;

Fig. 4 is a diagrammatic view showing thedifferent curves and angles tobe dressed on the face of the emery wheel;

Fig. 5 is a view similar to Fig..3'but showin the position of thediamond 0r dresseras it is approaching the end of its cut;

Fig. 6 is a vertical cross section taken on line VI-VI of Fig. 5;

Fig-7 is across section taken on line vrI-vn of Fig. 5; 1 0

a Fig. 8 is a vertical longitudinal section taken on line VIII-VIII ofFig. 5; and

Fig. 9 is a perspective view of a stop member.

The contour .dresser forming the subject matter oi the present inventionis designed for attachment to a universal grinding machine of thegeneral type shown in Figs. 1 and 2. The grinding or emery wheelindicated at A of the universal machine is generally motor-driven and ismounted in such a manner that it may be moved to or away from alongitudinalmovable table B by a hand wheel C. The table proper is movedby hand-wheel D and a longitudinallyextending slot E is formed in thetable and is utilized for the purpose of attaching and securing thecontour dresser generally indicated at F.

The contour dresser is best shown inFlgs. 3 to '8, inclusive. Itcomprises a base plate 2 secured to the table by means of a pair ofclamps I and l. The plate I may be disposed on an angle to the slot E orthe longitudinal axis 'of the table and this is accomplished byproviding a pivot pin 5 adjacent one end of the plate about which theplate may swing when the clamps 3 and 4 are released. A pin 6 is securedto the opposite end of the base plate and when this pin engages a luginformed, on the clamp 3 the base plate aligns with the longitudinalaxis of the tablebut, ii the plate is swung about the pivot Bin adirection which causes the pin 8 to move away from the lug to, plate Iwill assume an angular position and the angle may be determined byinsertion of a gauge block between the pin 8 and the lug 8a. Theimportance of the angular adjustment oi. the

base plate with relation to the longitudinal axis or the table willhereinaiterbe described.

Supported by thebase-plate is an index plate I. Each side of the baseplate is beveled, as shown in Fig. 6, and. a' pair of gibs 8-8 securedto the lower face of the index plate secures said plate to the baseplate but permits longitudinal movement of the index plate with relationto the base plate, such longitudinal movement being imparted by a leverl pivoted to the base plate as in unison the plate It is always'hiddenbelow the plate II. The intermediate plat It is pivoted to the indexplate I by means of a pin 18 carried by the index plate. The plate I!sup ported by the intermediate plate It is slidably mounted thereon andmay be moved radially inwardly or outwardly with relation to the pivotl8.

To accomplish this, plate I I is slotted, as shown at l9. A gib 29 isdisposed in the slot and this is secured to the intermediate plate byscrews. Hence, when plate I! i radially adjusted with relation to thepivot l9, it may be clamped and secured by the gib and the screws 2|.The intermediate plate and the sliding plate I! will accordingly move inunison when swung about the pivot l9 and their movement about said pivotin the direction of the lever 9 is limited by an adjustable stop screw22 carried by the index plate I. The movement of these plates is alsofrictionally resisted by a raduated segment 23 which is secured to theindex plate I. This graduated segment overlays the outer edge of theintermediate plate I, as indicated at 23c (see Fig. 6) and when thescrews 24 which secure the graduated segment to the plate 'I aretightened, sufficient friction is supplied to the outer edge of theintermediate plate to prevent free movement to the plates l9 and I1.

The sliding plate I! carries a pivot pin 25 and pivotally mountedthereon and supp rted by the plate I! is a top plate 26 which isprovided with a handle 21. Guide-ways 29 are formed on the forward endof the top plate 26 and slidably mounted therein and adapted to beclamped in the guide-ways is a head member 29 which carries a diamondcutter or dresser 39. A shoulder 3| is formed on the top plate and thisforms a support for a gauge block hereinafter to be described.

Two stop members in the form of adjustable screwshave heretofore beenreferred to, to wit, the stop screw l and stop screw 22. One more stopmember is required and that is indicated at 33. This stop member is bestshown in Fig. 9. It is a stepped lug having a stop shoulder 3,4 formedthereon. Two holes 35 are drilled in the lug and screws are passedtherethrough to secure the lug as a whole to the intermediate plate 19(see Figs. 3 and 4). The outer face of the stop lug 33- is provided withvernier graduation as indicated at 36 and their function willhereinafter be described.

Before describing the operation of the machine, let it be assumed thatthe contour to be dressed is that shown in Fig. 4. This contour consistsof one face K which is parallel to the outer face L of the wheel, acurve G struck from the center M, a curve H struck from the center N anda face I disposed on an angle to the inner-face J. It will be noted thatthe radius of curve G is smaller than the radius of curve H and thatwhere the curves join; they are tangent to each other and it should alsobe noted that the ends of the curves are tangent to the faces K and I.In view of the fact that the contour consists of two curves of differentradii and two. faces which are disposed at different angles, it isobvious that several movements must be imparted to the diamond cutter 39in order that an exact contour may be reface I, is accomplished byadjusting the base plate to the angle of that face and then impartinglongitudinal movement to the machine as a whole.

To illustrate this in more detail, reference will bemadetoFig. 3.Inthisinstancethewheelhas direction of arrow a, the top plate togetherwith a head member 29 carrying the cutter '39 will swing about the pivot25 and the curve G of the smallest radius will be dressed. During thismovement, the face 21a of the handle 21- will contact the stop shoulder34 formed on the stop member, 33 thereby preventing further swingingmovement about the pivot 25. By continuing swinging movement by means ofthe handle, plates 16 and I1 together with the top plate 26 and the head29 carried thereby will continue to swing but they will now pivot aboutthe pin l8 and, as this is the point of the larger radius, the curvedportion H of the wheel will be dressed and when that curve is completed,plate I! will engage the stop screw 22 when further swinging of theplates is stopped. Now the dressing of the wheel can be completed bymerely grasping the lever 9 and pulling it in the direction of arrow b.This imparts longitudinal movement to the machine as a whole and theface -I will thus be dressed and the dressing operation will becompleted. If the face I is atright angles to the faces J and L, angularadjustment of the base plate is unnecessary. However, if the faceportion 1 of the wheel is disposed on an angle, for instance of threedegrees'with relation to a right angle, then the base would previouslyhave been adjusted to assume that angle and that angle was determined byplacing a gauge block between the pin 6 and the lug 9a of the clamp 3and then securing the base plate by means of the clamps 3 and I.

In Fig. 5 the diamond oint or dresser 39 is shown in-the positionassumed when it has completed dressing of the faces K, G and H and it isat this point that lever 9 is grasped to move the whole machinelongitudinally so as to dress the face I. In this position the diamondor cutter will have moved beyond the inner face J of the wheel and themechanism as a whole will assume the position shown in Fig. 5 exceptthat it will be moved further to the left so that the diamond will clearthe face J. This is the position assumed by the entire mechanism when itis ,to be set up to dress the different curves and faces.

The setting up operation is very simple. For instance, by loosening thegib plates 29-28 the head member 29 carrying the cutter 30 may be movedinwardly on the plate until the cutting point of the diamond assumes aposition directly over the center of the pin or pivot 25, and byloosening the screws 2| of the gib 29, plate i'l may be moved until thepivot 25 is directly above pivot I9. When this position is assumed bythe several plates, the machine may be said to be at zero. Now, if thecontour shown in Fig. 4 is to be dressed and the operator desires to setthe machine to dress these faces and curves, the

operator will first measure on the drawing the distance of the shorterradius and let it be assumed that this distance is a half inch. Whenthis dimension has been determined, he moves the head 29 outwardlybeyond the center point or pivot 25 sufllciently far to permit him toinsert a gauge block measuring half an inch between the shoulder 3| andthe inner end 290 of the hehd. Then by pushing the head back against thegauge block until physical flrm contact is swung about the pivot 23, itwill produce the curve of small radius. To set the machine for thesecond or larger radius, the operator merely measures the distance ofthe line drawn between M and N. This distance is marked a quarter of aninch and all he has to do when this dimension is determined is to placea gauge block of that dimension between the opposite face of theshoulder 3| and the stop member 33. It is understood of course that thegib 20 is free at that time so that the plate I! may be moved inwardlyor outwardly. Thi movement changes the position of the pivot 25 to thatof the larger radius, then by tightening the gib 20 this position willbe maintained. The next adjustment is the insertion of a gauge blockbetween'the pin 6 and the lug 6a if the face I is to be on an angle. Theangle may be one, two, three or more degrees as the case may be and agauge block to take care of the angle required will therefore beintroduced and then the base will be secured by tightening the clamps 3and 4. The next adjustment determines the position of the vertical faceK. Let it be assumed that between the face K and the face L, there is aquarter of an inch. If that is the case,.the stop screw I5 is adjustedto a quarter of an inch, thus the cutter point shown in the position ofFig. 3 will be in the right position to dress this face when the wheelproper is moved toward the diamond point by means of the hand wheel C ofthe universal grinder. The final adjustment is the setting of the stoplug 33. It should be noted on Fig. 4 that a radial line is drawn betweenthe radius points N and M. This line contacts the curves G and H wherethey join. This line may, for instance, be disposed on an angle of 30degrees and, if it is, the graduate segment 23, is released by slackingthe screws 24. Plates I6 and H are then swung about the pivot 13 untilthe shoulder 34 aligns with the 30 degree graduation mark, as shown inFig. 3. Plates l1 and I6 are then frictionally secured in this positionby tightening the screws 24 of the graduate segment. Thus when the topplate is swung about its pivot 25 by means of handle 21, it will firstswing about the short radius and will stop when the face 21a of thelever engages a stop shoulder 34. This point is the line indicated onFig. 4 where the curves G and H meet and where they are tangent to eachother. When the face 21a contacts the shoulder 34 and further movementis imparted to the lever 21, then all plates will move in unison aboutthe pivot l8 or the pivot of the larger radius and it is in this mannerthat the curved face H is dressed. A stop member is shown at 42 in Figs.5 and 8. This limits movement of the several plates beyond the positionshown in Fig. 3 while the stop screws l5 and 22 limit movement in theopposite direction.

By referring to Fig. 9 it will be noted that the stop lug 33 has avernier scale formed on its outer face as indicated at 36. This scale isused in connection with the graduations of the segment 23 when adjustingthe stop lug 33. That is the angle to which the stop lug is set may notalways be exactly 30 degrees, it might be 25 degrees, or it might be,for instance, 32 degrees, and 16 seconds, and so on. Hence, by using thevernier in connection with the graduations on the scale 23, accuratesettin of the stop lug'33 results.

From the foregoing, it should be apparent that the machine here shownsaves the expensive work of forming enlarged templets for the grindin ofcontours of varying curvatures. As the pivot points of the machine areadjustable, it is obvious that surfaces composed of two curves may bemade to many dimensions. Similarly, as the base of the machine-isangularly adjustable, angular faces may also be taken care of andvertical or parallel faces can be taken care of by movement of the wheelto and away from the contour dresser, and while this and other featuresof my invention have been more or less specifically 'described, I wishit understood that various changes may be made within the scope of theappended claims, and that the materials and finish of the parts employedmay be such as the experience of the manufacturer may dictatemr varyinguses may demand.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A contour dresser comprising a base plate, means for securing saidplate to the tabl of a universal grinder, an index plate supported bythe base plate, means for imparting longitudinal movement to the indexplate upon the base plate, an intermediate plate pivoted to the indexplate, a sliding plate supported by the intermediat plate, a pivotsecured to the sliding plate, means for radially adjusting the slidinplate with relation to the pivot on the intermediate plate, a top platesupported by the sliding plate and free to swing about the pivot carriedby the sliding plate, a head member supported by the top plate, adressing tool carried by the head, means for radially adjusting the headand dressing tool with relation to the pivot about which the top plate sings, adjustable means limiting swinging movement of the top plate withrelation to the sliding plate, adjustable means limiting swingingmovement of the sliding and intermediate plates with relation to theindex plate, and means for imparting swinging movement first to the topplate and then to the top plate and the sliding and intermediate platein unison.

2. A contour dresser comprising a base plate, means for securing saidplate to the table of a universal grinder, an index plate supported bythe base plate, means for imparting longitudinal movement to the indexplate upon the base plate, an intermediate plate pivoted to the indexplate, a sliding plate supported by the intermediate plate, a pivotsecured to th sliding plate, means for radially adjusting the slidingplate with relation to the pivot on the intermediate plate, a top platesupported by the sliding plate and free to sway about the pivot carriedby the sliding plate, a head member supported by the top plate, adressing tool carried by the head, means for radially adjusting the headand dressing tool with relation to the pivot about which the top plateswings, adjustable means limiting swinging movement of the top platewith relation to the sliding plate, adjustable means limiting swingingmovement of the sliding and intermediate plates with relation to theindex plate, means for imparting swinging movement first to the topplate and then to the top plate and the sliding and intermediate platein unison, and means for imparting longitudinal movement to the indexplate, the intermediate and sliding plate, and the top plate and thehead member carried thereby along the base plate in unison.

3. A contour dresser comprising a base plate, means for securing saidplate to the table of a universal grinder, an index plate supported bythe base plate, means for imparting longitudinal movement to the indexplate upon the base plate, an intermediate plate pivoted to the indexplate, a sliding plate supported by th intermediate plate, means forradially adjusting the sliding plate with relation to the pivot of theintermediv swings, adjustable means limiting swinging movement of thetop plate with relation to the sliding plate, adjustable means limitingswinging movement of the sliding and intermediate plates with relationto the index plate, means forimparting swinging movement first to thetop plate and then to the top plate and the sliding plate andintermedlate plate in unison, means for imparting longitudinal movementto the index plate, the intermediate and sliding plate, and the topplate and the head member carried thereby along the base plate inunison, means for adjusting and securing the base plate at an angle tothe longitudinal axis of the table of the universal grinder, andadjustable means limiting longitudinal movement of the index plate andall the plates carried thereby on the base plate in one direction.

WARD H. HAHIR.

